Neonatal jaundice is a common condition, affecting some 14 million newborns annually. Symptoms such as yellowing skin and poor appetite can alarm new parents, but jaundice is relatively simple to treat with a light bath. Non-invasive phototherapy shines high-intensity blue light on an affected infant’s skin, quickly breaking down excess bilirubin in the blood.

That’s the standard treatment, at least, in hospitals where the power grid is stable and the cost of replacing burned-out...

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